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How does a calculator get answers instantly?

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How does a calculator get answers instantly?
You press 7 + 5 and ~~before you can blink~~, the screen says 12. No pencil. No counting on fingers. Just **instant answ

You press 7 + 5 and before you can blink, the screen says 12. No pencil. No counting on fingers. Just instant answers. How does a tiny plastic box do math faster than your brain?

Inside every calculator sits a tiny chip — a brain made of metal and silicon, smaller than your thumbnail. But unlike your brain, which thinks in words and pictures, this chip only understands two things: ON and OFF. One and zero. Electricity flowing, or electricity stopped.

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